perl-install/bootloader.pm


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package bootloader; # $Id$

use diagnostics;
use strict;

#-######################################################################################
#- misc imports
#-######################################################################################
use common;
use fs::type;
use fs::get;
use fs::loopback;
use fs::proc_partitions;
use log;
use any;
use devices;
use detect_devices;
use partition_table::raw;
use run_program;
use modules;

#-#####################################################################################
#- Functions
#-#####################################################################################
my $vmlinuz_regexp = 'vmlinuz|win4lin';
my $decompose_vmlinuz_name = qr/((?:$vmlinuz_regexp).*?)-(\d+\.\d+.*)/;

sub expand_vmlinuz_symlink {
    my ($vmlinuz) = @_;
    my $f = $::prefix . ($vmlinuz =~ m!^/! ? $vmlinuz : "/boot/$vmlinuz");
    -l $f ? readlink($f) : $vmlinuz;
}

sub installed_vmlinuz_raw() { grep { /^($vmlinuz_regexp)/ } all("$::prefix/boot") }
sub installed_vmlinuz() { grep { ! -l "$::prefix/boot/$_" } installed_vmlinuz_raw() }
sub vmlinuz2version {
    my ($vmlinuz) = @_;
    expand_vmlinuz_symlink($vmlinuz) =~ /$decompose_vmlinuz_name/ && $2;
}
sub vmlinuz2basename {
    my ($vmlinuz) = @_;
    expand_vmlinuz_symlink($vmlinuz) =~ /$decompose_vmlinuz_name/ && $1;
}
sub basename2initrd_basename {
    my ($basename) = @_;
    $basename =~ s!vmlinuz-?!!; #- here we do not use $vmlinuz_regexp since we explictly want to keep all that is not "vmlinuz"
    'initrd' . ($basename ? "-$basename" : '');    
}
sub kernel_str2vmlinuz_long {
    my ($kernel) = @_;
    $kernel->{basename} . '-' . $kernel->{version};
}
sub kernel_str2initrd_long {
    my ($kernel) = @_;
    basename2initrd_basename($kernel->{basename}) . '-' . $kernel->{version} . '.img';
}
sub kernel_str2vmlinuz_short {
    my ($kernel) = @_;
    if ($kernel->{use_long_name}) {
	kernel_str2vmlinuz_long($kernel);
    } else {
	my $ext = $kernel->{ext} ? "-$kernel->{ext}" : '';
	$kernel->{basename} . $ext;
    }
}
sub kernel_str2initrd_short {
    my ($kernel) = @_;
    if ($kernel->{use_long_name}) {
	kernel_str2initrd_long($kernel);
    } else {
	my $ext = $kernel->{ext} ? "-$kernel->{ext}" : '';
	basename2initrd_basename($kernel->{basename}) . $ext . '.img';
    }
}

sub vmlinuz2kernel_str {
    my ($vmlinuz) = @_;
    my ($basename, $version) = expand_vmlinuz_symlink($vmlinuz) =~ /$decompose_vmlinuz_name/ or return;
    { 
	basename => $basename,
	version => $version, 
	$version =~ /(.*mdk)-?(.*)/ ? (ext => $2, version_no_ext => $1) : (version_no_ext => $version),
    };
}
sub kernel_str2label {
    my ($kernel, $o_use_long_name) = @_;
    my $base = $kernel->{basename} eq 'vmlinuz' ? 'linux' : $kernel->{basename};
    $o_use_long_name || $kernel->{use_long_name} ?
      sanitize_ver($base, $kernel) : 
        $kernel->{ext} ? "$base-$kernel->{ext}" : $base;
}

sub get {
    my ($vmlinuz, $bootloader) = @_;
    $_->{kernel_or_dev} && $_->{kernel_or_dev} eq $vmlinuz and return $_ foreach @{$bootloader->{entries}};
    undef;
}
sub get_label {
    my ($label, $bootloader) = @_;
    $_->{label} && lc(make_label_lilo_compatible($_->{label})) eq lc(make_label_lilo_compatible($label)) and return $_ foreach @{$bootloader->{entries}};
    undef;
}

sub mkinitrd {
    my ($kernel_version, $entry) = @_;

    my $initrd = $entry->{initrd};
    $::testing || -e "$::prefix/$initrd" and return 1;

    my $loop_boot = fs::loopback::prepare_boot();

    modules::load('loop');
    my @options = (
		   "-v", "-f", $initrd, "--ifneeded", $kernel_version, 
		   if_($entry->{initrd_options}, split(' ', $entry->{initrd_options})),
		  );
    if (!run_program::rooted($::prefix, 'mkinitrd', @options)) {
	unlink("$::prefix/$initrd");
	die "mkinitrd failed:\n(mkinitrd @options))";
    }
    add_boot_splash($entry->{initrd}, $entry->{vga});

    fs::loopback::save_boot($loop_boot);

    -e "$::prefix/$initrd";
}

sub remove_boot_splash {
    my ($initrd) = @_;
    run_program::rooted($::prefix, '/usr/share/bootsplash/scripts/remove-boot-splash', $initrd);
}
sub add_boot_splash {
    my ($initrd, $vga) = @_;

    $vga or return;

    require Xconfig::resolution_and_depth;
    if (my $res = Xconfig::resolution_and_depth::from_bios($vga)) {
	run_program::rooted($::prefix, '/usr/share/bootsplash/scripts/make-boot-splash', $initrd, $res->{X});
    } else {
	log::l("unknown vga bios mode $vga");
    }
}

sub read {
    my ($all_hds) = @_;
    my $fstab = [ fs::get::fstab($all_hds) ];
    foreach my $main_method (main_method_choices()) {
	my $f = $bootloader::{"read_$main_method"} or die "unknown bootloader method $main_method (read)";
	my $bootloader = $f->($fstab);

	cleanup_entries($bootloader);

	my @devs = $bootloader->{boot};
	if ($bootloader->{'raid-extra-boot'} =~ /mbr/ && 
	    (my $md = fs::get::device2part($bootloader->{boot}, $all_hds->{raids}))) {
	    @devs = map { $_->{rootDevice} } @{$md->{disks}};
	} elsif ($bootloader->{'raid-extra-boot'} =~ m!/dev/!) {
	    @devs = split(',', $bootloader->{'raid-extra-boot'});
	}

	my ($type) = map {
	    if (m!/fd\d+$!) {
		warn "not checking the method on floppy, assuming $main_method is right\n";
		$main_method;
	    } elsif ($main_method eq 'yaboot') {
		#- not checking on ppc, there's only yaboot anyway :)
		$main_method;
	    } elsif ($main_method eq 'cromwell') {
		#- XBox
		$main_method;
	    } elsif (my $type = partition_table::raw::typeOfMBR($_)) {
		warn "typeOfMBR $type on $_ for method $main_method\n" if $ENV{DEBUG};
		$type;
	    } else { () }
	} @devs;

	if ($type eq $main_method) {
	    my @prefered_entries = map { get_label($_, $bootloader) } $bootloader->{default}, 'linux';

	    if (my $default = find { $_ && $_->{type} eq 'image' } (@prefered_entries, @{$bootloader->{entries}})) {
		$bootloader->{default_vga} = $default->{vga};
		$bootloader->{perImageAppend} ||= $default->{append};
		log::l("perImageAppend is now $bootloader->{perImageAppend}");
	    }
	    return $bootloader;
	}
    }
}

sub read_grub {
    my ($fstab) = @_;

    my $grub2dev = read_grub_device_map();

    my $bootloader = read_grub_menu_lst($fstab, $grub2dev) or return;

    read_grub_install_sh($bootloader, $grub2dev);

    $bootloader;
}

sub read_grub_install_sh {
    my ($bootloader, $grub2dev) = @_;

    #- matches either:
    #-   setup (hd0)
    #-   install (hd0,0)/boot/grub/stage1 d (hd0) (hd0,0)/boot/grub/stage2 p (hd0,0)/boot/grub/menu.lst
    if (cat_("$::prefix/boot/grub/install.sh") =~ /^(?:setup.*|install\s.*\sd)\s+(\(.*?\))/m) {
	$bootloader->{boot} = grub2dev($1, $grub2dev);
    }    
}

sub read_grub_menu_lst {
    my ($fstab, $grub2dev) = @_;
    my $global = 1;
    my ($e, %b);

    my $menu_lst_file = "$::prefix/boot/grub/menu.lst";
    -e $menu_lst_file or return;

    foreach (cat_($menu_lst_file)) {
        chomp;
	s/^\s*//; s/\s*$//;
        next if /^#/ || /^$/;
	my ($keyword, $v) = split('[ \t=]+', $_, 2) or
	  warn qq(unknown line in /boot/grub/menu.lst: "$_"\n), next;

        if ($keyword eq 'title') {
            push @{$b{entries}}, $e = { label => $v };
            $global = 0;
        } elsif ($global) {
            $b{$keyword} = $v eq '' ? 1 : grub2file($v, $grub2dev, $fstab);
        } else {
            if ($keyword eq 'kernel') {
                $e->{type} = 'image';
                (my $kernel, $e->{append}) = split(' ', $v, 2);
		$e->{root} = $1 if $e->{append} =~ s/root=(\S*)\s*//;
		$e->{kernel_or_dev} = grub2file($kernel, $grub2dev, $fstab);
            } elsif ($keyword eq 'root') {
                $e->{type} = 'other';
		if ($v !~ /,/) {
		    $e->{unsafe} = 1;
		}
                $e->{kernel_or_dev} = grub2dev($v, $grub2dev);
                $e->{append} = "";
            } elsif ($keyword eq 'initrd') {
                $e->{initrd} = grub2file($v, $grub2dev, $fstab);
            } elsif ($keyword eq 'map') {
		$e->{mapdrive}{$2} = $1 if $v =~ m/\((.*)\) \((.*)\)/;
            } elsif ($keyword eq 'module') {
		push @{$e->{modules}}, $v;
	    } else {
		$e->{$keyword} = $v eq '' ? 1 : $v;
	    }
        }
    }